PDI springs are the most highly regarded airsoft sniper rifle upgrade springs available. PDI springs are longer lasting with less wear, meaning more velocity and more accuracy. This 380% spring fits M24 and L96 sniper rifles.
PDI springs are all "perfect" variable pitch, giving light compression and fast return. Some other springs use a different "variable pitch", but they're only connecting some different pitches.Those are difficult to compress and do not give the desired power.
PDI uses silicon chrome steel to make the springs. This allows for fine power and pitch adjustments, so we can offer different power levels. Each spring may look different because PDI SPR springs are individually made by skilled craftsman. Springs that provide the same power may be slightly longer or shorter. PDI springs can't be made by machines because of the completely variable pitch.
This spring can produce velocities from 560-600+ FPS. This spring is not designed for stock sniper rifles, and will increase the rate of wear on other parts.
The PDI 380% SPR spring is 13mm in diameter, and requires the PDI 9mm spring guide and PDI piston for correct use. Because of the increased size, PDI springs do not fit with stock piston and spring guide components.